Please help me on identifying the following chip.

Smd mark says "5MM 615".

Picture:

[![enter image description here][1]][1]


  [1]: https://i.sstatic.net/eAoQK0ov.jpg

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Addetto better picture.
It appeaers to me 5MM on the first line with 5M overlined.
615 on the bottom line with 6 and 5 underlined.